Direction finder



May 23," 1933. v LElB 1,910,023

DIRECTION FINDER Filed April 23 1930 I INVENTOR AUGUST LEIB BY M/%@m ATTORNEY Patented May 23, 1933 UNITED STATES PATENT oFFIcEf j.

AUGUST LEIIB, OF BERLIN, GERMANY, ASSIGNOR 'ro TELRFUNKEN' GEsELL'sonAFT" FUR DRAHTLOSE TELEGRAPHIE M. B. H; or? BERLIN, GERMANY, AooRPoRATIoN 0F GERMANY DIRECTION FINDER Application filed April 23, 1930, Serial No. 446,478, and in Germany June 5, 1929.

The present invention is concerned with a safety device for load-lifting rope drives which has the particular purpose of relieving the ropes as soon as a certain limiting or end position has been reached.

According to the invention, there is provided an element being in engaged relation with a carrier or support fixed in reference to space and an element being engaged with the load in such a manner that the said two elements can be inter-coupled when the end position is reached and that the said elements then take care of the supporting of the load. This can be accomplished more suitably in this manner that of the two elements insuring the'relieving of the ropes or cables, one is furnished with one or more bolts or claws, while the other one is provided with corresponding slots, so that upon reaching the liminal position, the clamping or looking members of one come to be introduced in the slots of the other element, and that, by mutual turning, the two elements are brought to inter-engage as the cable tension diminishes.

In order to lock the said two clutch elements in their end position, it is advisable to provide a recess at the end of the slot of one of the said elements into which the heavier end of the bolt or the claw of the other gripping element is recessed or engages as the rope tension decreases.

One embodiment of the safety device according to this invention shall be described in what follows by reference to the accompanying drawing as applied to the outward movement of pressure-proof direction finder antennae.

Figure 1 is a vertical view of the device according to this invention and the revoluble shaft carrying the frame of the directionfinding antenna; while,

Figure 2 is a top view of the coupling element with guiding slot in engaged relationship with the said direction finder antenna shaft.

Figure 3 is a view of the shaft and the frame aerial supported thereby.

Referring to Fig.1, a is a rotatable tubular vertical shaft having at its top end a frame aerial closure member 1, as shown in Fig.

The coilsor turns of the direction-finderan-i tenna may be accommodated within the memher-1.v b is the control wheel by means ofwhich the shaft a conjointly with the direction-finding antenna is oriented. It is often necessary that an antenna-of this typeshould be adapted to move from an unexposed position to anexposed position. Accordingto' the present invention the'aerial is made shift-' able along its axis of rotation.- This is ef-' fected by the agency of suitable ropes 00, theends of which are secured to a disk which is though rotatablein relation to the shaft being mobile therewith in vertical direction; The said ropes are guided over idling pulleys c the shaftsof which are supported in" fixed bearings attached to a p'late'5 fixed to frame 9. Tension may be applied to the ropes 0 in any known manner to move the shafta axially so that the frame aerial in 1s moved to an exposed position with refer--" ence to support-g. v

In order that the ropesac'may be relieved of strain in the raised position of the-antenna,- two clutch members it andf arepr Vided'aG- cording to'the invention. h as here shown denotes a number of vertical bolts-disposed upon the plate 5 fixed to the frame support 9, said bolts being enlarged at the bottomends-as shown at 7:. The clutch element 7 con sists of a disk being vertically mobile conjointly with the shaft, though being revoluble in relation thereto. Theisaid disk is provided i with a number of slits slightly larger '--inwidth than the diameter of the small portions of the bolts h. The slits i terminate in'one end in recesses m large enough to permit the bolt headsfc to rest therein and in the other'end' inlarge openings n Which-permit theboltz heads is to pass through the member f. hen the antenna has been moved out into its exposed position, as the ropes 00 are pulled over pulleys manually or are pulled by being wound upon a drum or the like, the

clutch member f comes to be in the neighborhood of the bolts h. The member f, for in stance, by suitably turning by the agency of the handle j, must first be so set that the bolt heads 70 will pass through the enlarged openings n of slots 2'. Next the disk I is so turned that the bolts in will move into the guides 2' until the bolt heads 70 come to be positioned opposite the recesses m of the disk d. For 5 locking the two clutch members there suflices the reduction of the pull-on ropes 00, with the bolt heads is being incidentally sunk into the recesses on. As a result the load is then carried by the heads 707a.

Unlocking can be accomplished only after the ropes have been tensioned again and after the bolt heads have been removed from the recesses m.

I claim:

1. In a device for moving a direction finder antenna into an exposed position the combi' nation of, a shaft connected with said antenna, means for rotating said shaft, means connected with said shaft for moving said 201 antenna into an exposed position, and means connected with said shaft for locking said antenna in said exposed position.

2. In direction finding apparatus tobe used with a water-proof aerial system the combination of, a rotatable shaft connected with said aerial system, manual means for moving said shaft longitudinally, and means for retaining said shaft in position including a rotatable disc longitudinally fixed with respect to said shaft, a plurality of slots in said disc, said slot terminating in recesses, a plurality of bolts adapted to enter such slots and proj ections on said bolts adapted to be retained in said recesses on rotation of said disc.

? 3. In apparatus to be used with shielded direction finding devices adapted to be moved from an unexposed position to an exposed position the combination of a support, a direction finder shaft mounted for rotation in said 495 support, means for moving said shaft longitudinally with respect to' said support including a disc longitudinally fixed with respect to said shaft, a plurality of ropes engaged to said disc and a plurality of pulleys engaging 453 said ropes, said pulleys being fastened to said support, and means for retaining said direction finder in an exposed position including a circumferential slot in said disc, said slot terminating in an enlarged opening 593 in one end and a recessin the other end, a bolt fastened to said support, said bolt having an enlarged head adapted to enter the enlarged opening in said slot when the direction finder shaft is in an exposed position and to be en gaged in the recess in said slot on rotation of said disc.

AUGUST LEIB. 

